Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/2823—Wires
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/02—Casings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/08—Cooling; Ventilating
  • H01F27/10—Liquid cooling
  • H01F27/12—Oil cooling
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/24—Magnetic cores
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/32—Insulating of coils, windings, or parts thereof
  • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/32—Insulating of coils, windings, or parts thereof
  • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
  • H01F27/325—Coil bobbins
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F19/00—Fixed transformers or mutual inductances of the signal type
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F5/00—Coils
  • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
  • H01F2005/025—Coils wound on non-magnetic supports, e.g. formers wound on coaxial arrangement of two or more formers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F27/00—Details of transformers or inductances, in general
  • H01F27/28—Coils; Windings; Conductive connections
  • H01F27/32—Insulating of coils, windings, or parts thereof
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05G—X-RAY TECHNIQUE
  • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
  • H05G1/02—Constructional details
  • H05G1/04—Mounting the X-ray tube within a closed housing
  • H05G1/06—X-ray tube and at least part of the power supply apparatus being mounted within the same housing
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05G—X-RAY TECHNIQUE
  • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
  • H05G1/08—Electrical details

Definitions

• the present invention characterizes the special construction characteristics that the insulator on which the core, the primary coil and the secondary coil are mounted particularly, so that sufficient insulation between both windings, a maximum magnetic coupling, and the possibility is achieved of cooling the primary and secondary windings by means of oil, achieving a transformer that in a very small space can adapt to the measurements of an x-ray tube.
• the present invention is circumscribed within the scope of transformers, and particularly among those of high power, high frequency and high voltage together.
• a High Voltage transformer requires large insulation between its primary and secondary windings (large separation distance between high and low voltage windings or great thickness of the insulators). This separation between windings decreases the magnetic coupling between them and therefore increases the dispersion reactance, limiting the output power.
• a High Frequency transformer requires very good coupling between the primary and secondary windings, to have an acceptable performance and so that the output power is not limited by an inefficient coupling (excessive reactance between primary and secondary).
• the distance between the primary and secondary windings is as short as possible (which is just the opposite of what is needed for a High Voltage transformer).
• the higher the operating frequency the better the coupling has to be, because the reactance between the windings is directly proportional to the frequency.
• a High Power transformer requires that the winding impedance be very small and that the reactance between the two be low enough not to limit the output power.
• the transformer is immersed in oil (mineral or vegetable), which has two main objectives: it serves as an electrical insulator and as a refrigerant for the electrical and magnetic elements of the transformer.
• the transformer has a core on which the primary winding is arranged, leaving this assembly housed inside a hollow tubular element that is part of an insulator.
• the insulator is formed by two parts that are symmetrical with respect to a transverse vertical plant, each part or half having a hollow tubular element housed inside an outer casing of each half of the insulator, and connected one end of the hollow tubular element with the outer shell, so that the inner space of the hollow tubular element is connected with the outside and an annular space comprised between the outer wall of the tubular element and the inner wall of the outer shell is defined in each half of the insulator, where it is arranged secondary or high voltage winding.
• each half of the insulator has the particularity of protruding from the free edge of the outer shell, so that when coupling the two halves of the insulator, the free ends of the hollow tubular elements remain in contact, while between The two outer shells define a groove, which will be located at zero level volts, where great insulation is not needed and yet allows oil flow to come into contact with the secondary winding circuitry.
• the primary winding and the secondary winding occupy the same space longitudinally, which maximizes the magnetic coupling between the windings and therefore the reactance between them is also minimized, which allows maximizing the output power.
• each half of the insulator makes it possible to form a groove located at the level of zero volts where great insulation is not needed and yet allows the oil to come into contact with the secondary winding.
• Figure 1 B shows the section obtained by cutting the transformer of Figure 1 A through a plane A-A
• Figure 1 C shows the section obtained by cutting the transformer by a plane C-C
• Figure 1 D shows the section obtained by cutting the transformer by a plane B-B
• Figure 2 shows the representation of the transformer in perspective.
• Figure 4.1 shows the side view of one of the halves of the insulator.
• Figure 4.2 shows the section obtained by cutting the insulator by a DD plane PREFERRED EMBODIMENT OF THE INVENTION.
• FIG. 1 A, 1 B, 1 C and 1 D we can see a magnetic core (1) on which the primary winding (2) is arranged with a basic low voltage insulation between them, because both work very close to zero volts, which is the safety ground level (GND).
• GND safety ground level
• the primary winding assembly (2) and magnetic core (1) is housed inside a hollow tubular element (8) defined in the transformer isolator (3), and on said hollow tubular element (8) the winding is arranged secondary (4).
• both the magnetic core (1) and the primary one (2) are in direct contact and allowing the flow of oil through them, to be able to easily evacuate the heat produced by the transformer's operating losses.
• Figure 1 B shows that the secondary winding (4) is divided into different sections wound in independent reels (4.1 to 4.8), whose tension is rectified, filtered and connected in series to sum all the tensions of each reel by means of the rectifier (9) and filter (10).
• the resistive divider (1 1) is to take a sample of the output voltage and feed it back to the control circuit, in this way we will have absolute and precise control of the output voltage.
• the voltage of the transformer decreases progressively, thus for a 150KV transformer and with negative polarity towards the left side, it reaches a minimum value of -75kV at the left end. In the same progressive way, it grows linearly with positive polarity towards the right side of the transformer, reaching a maximum value of + 75kV at the right end. In this way, we will have -75kV on the left side, growing linearly to + 75kV on the right side, which gives us a total potential difference of 150kV between both ends, with the potential of zero volts (ground or GND) in The center of the transformer.
• Both the rectifier (9), and the filter (10), and the resistive divider (1 1) have the same potential values along them. This means that there is hardly any difference in potential between them and allows them to be placed very close together, as they are equipotential circuits. It can be seen that the primary winding (2) and the secondary winding (4) formed by the reels (4.1) to (4.8) occupy the same space longitudinally to maximize the magnetic coupling between them and therefore minimize the reactance between them, which will allow us to maximize the output power.
• Figures 2, 3, 4.1 and 4.2 show the construction characteristics of the insulator (3) which, as can be seen, comprises two halves or parts (6) and (7), which are symmetrical with respect to a vertical plane to the insulator (3), where each of the parts or halves (6) and (7) comprises a hollow tubular element (3.1) where the assembly formed by the core (1) and the primary winding (2) is housed, wrapping the element hollow tubular is an outer casing (3.2), and connected one end of the hollow tubular element with the outer casing (3.2), so that the inner space of the hollow tubular element (3.1) is connected with the outside and between the hollow tubular element ( 3.1) and the outer shell (3.2) defines an annular space (3.3), which is on which the secondary winding is arranged.
• Another characteristic of the insulator (3), and particularly of the tubular element (3.1) of each half (6) and (7), is that it has a length such that at one of its ends or free edge (3.4) it protrudes from the free edge ( 3.5) of the outer casing (3.2) (figure 4.2), so that when coupling both halves (6) and (7) by contacting the free edges (3.4) of the hollow tubular elements (3.1), between the free edges (3.4) of the outer housings (3.2), a hole or groove (5) is defined (figure 2), through which the cooling oil penetrates the secondary winding (4) housed in the annular space (3.3).
• the tubular element (8) formed by the hollow tubular elements (3.1) of each half (6) and (7) of the insulator (3).
• the thickness of the hollow tubular elements (3.1) is such that it allows on the one hand the insulation between both windings, and on the other hand a good magnetic coupling.
• each of the halves of the insulator (3) allows insulating the secondary winding and defining a groove through which oil flows through the secondary circuitry.
• the groove or space (5) defined in the insulator (3) allows the oil to penetrate into it and its contact with the secondary winding.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• X-Ray Techniques (AREA)
• Insulating Of Coils (AREA)
• Rectifiers (AREA)

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Citations (3)

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• 2014
  • 2014-01-28 SG SG11201508658YA patent/SG11201508658YA/en unknown
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  • 2014-01-28 CN CN201480018597.0A patent/CN105075400B/zh active Active
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  • 2014-01-28 EP EP14850093.7A patent/EP3102007B1/en active Active
  • 2014-01-28 JP JP2016565571A patent/JP6380771B2/ja active Active
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